package com.ty.tour.common;

import com.baomidou.mybatisplus.core.toolkit.Assert;
import com.baomidou.mybatisplus.core.toolkit.SystemClock;
import org.apache.ibatis.cache.CacheKey;
import org.apache.ibatis.executor.Executor;
import org.apache.ibatis.mapping.BoundSql;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.mapping.ParameterMapping;
import org.apache.ibatis.plugin.*;
import org.apache.ibatis.reflection.MetaObject;
import org.apache.ibatis.session.Configuration;
import org.apache.ibatis.session.ResultHandler;
import org.apache.ibatis.session.RowBounds;
import org.apache.ibatis.type.TypeHandlerRegistry;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.util.CollectionUtils;

import java.text.DateFormat;
import java.util.Date;
import java.util.List;
import java.util.Locale;
import java.util.Properties;
import java.util.regex.Matcher;

/**
 * 自定义 SQL 执行性能分析

 */
@Intercepts(value = {
        @Signature(type = Executor.class, method = "update", args = { MappedStatement.class, Object.class }),
        @Signature(type = Executor.class, method = "query", args = { MappedStatement.class, Object.class,
                RowBounds.class, ResultHandler.class, CacheKey.class, BoundSql.class }),
        @Signature(type = Executor.class, method = "query", args = { MappedStatement.class, Object.class,
                RowBounds.class, ResultHandler.class }) })
public class SqlStatementInterceptor implements Interceptor {
    private static Logger logger = LoggerFactory.getLogger(SqlStatementInterceptor.class);
    private boolean writeInLog = false;
    private long maxTime = 0L;
    private Properties properties;

    @Override
    public Object intercept(Invocation invocation) throws Throwable
    {
        Object returnValue;
        long start = SystemClock.now();
        returnValue = invocation.proceed();
        long end = SystemClock.now();
        long time = end - start;
        try {
            final Object[] args = invocation.getArgs();
            //获取原始的ms
            MappedStatement ms = (MappedStatement) args[0];
            Object parameter = null;
            //获取参数，if语句成立，表示sql语句有参数，参数格式是map形式
            if (invocation.getArgs().length > 1) {
                parameter = invocation.getArgs()[1];
            }
            String sqlId = ms.getId();// 获取到节点的id,即sql语句的id
            BoundSql boundSql = ms.getBoundSql(parameter);  // BoundSql就是封装myBatis最终产生的sql类
            Configuration configuration = ms.getConfiguration();  // 获取节点的配置
            String sql = getSql(configuration, boundSql, sqlId,time); // 获取到最终的sql语句

            if (this.isWriteInLog()) {
                if (this.getMaxTime() >= 1L && time > this.getMaxTime()) {
                    logger.error(sql);
                } else {
                    logger.info(sql);
                }
                System.err.println(sql);
            } else {
                System.err.println(sql);
                Assert.isFalse(this.getMaxTime() >= 1L && time > this.getMaxTime(), " The SQL execution time is too large, please optimize ! ", new Object[0]);
            }
        } catch (Exception e) {
            logger.error("拦截sql处理出差"+e.getMessage());
            e.printStackTrace();
        }
        return returnValue;
    }
    // 封装了一下sql语句，使得结果返回完整xml路径下的sql语句节点id + sql语句
    public static String getSql(Configuration configuration, BoundSql boundSql, String sqlId, long time) {
        String sql = showSql(configuration, boundSql);
        StringBuilder str = new StringBuilder(100);
        str.append(" Time：").append(time).append(" ms - ID：").append(sqlId).append("\n").append("Execute SQL：").append(sql).append("\n");
        return str.toString();
    }
    /*<br>    *如果参数是String，则添加单引号， 如果是日期，则转换为时间格式器并加单引号； 对参数是null和不是null的情况作了处理<br>　　*/
    private static String getParameterValue(Object obj) {
        String value = null;
        if (obj instanceof String) {
            value = "'" + obj.toString() + "'";
        } else if (obj instanceof Date) {
            DateFormat formatter = DateFormat.getDateTimeInstance(DateFormat.DEFAULT, DateFormat.DEFAULT, Locale.CHINA);
            value = "'" + formatter.format(new Date()) + "'";
        } else {
            if (obj != null) {
                value = obj.toString();
            } else {
                value = "";
            }

        }
        return value;
    }
    // 进行？的替换
    public static String showSql(Configuration configuration, BoundSql boundSql) {
        Object parameterObject = boundSql.getParameterObject();  // 获取参数
        List<ParameterMapping> parameterMappings = boundSql
                .getParameterMappings();
        String sql = boundSql.getSql().replaceAll("[\\s]+", " ");  // sql语句中多个空格都用一个空格代替
        if (!CollectionUtils.isEmpty(parameterMappings) && parameterObject != null) {
            TypeHandlerRegistry typeHandlerRegistry = configuration.getTypeHandlerRegistry(); // 获取类型处理器注册器，类型处理器的功能是进行java类型和数据库类型的转换<br>　　　　　　　// 如果根据parameterObject.getClass(）可以找到对应的类型，则替换
            if (typeHandlerRegistry.hasTypeHandler(parameterObject.getClass())) {
                sql = sql.replaceFirst("\\?", Matcher.quoteReplacement(getParameterValue(parameterObject)));

            } else {
                MetaObject metaObject = configuration.newMetaObject(parameterObject);// MetaObject主要是封装了originalObject对象，提供了get和set的方法用于获取和设置originalObject的属性值,主要支持对JavaBean、Collection、Map三种类型对象的操作
                for (ParameterMapping parameterMapping : parameterMappings) {
                    String propertyName = parameterMapping.getProperty();
                    if (metaObject.hasGetter(propertyName)) {
                        Object obj = metaObject.getValue(propertyName);
                        sql = sql.replaceFirst("\\?", Matcher.quoteReplacement(getParameterValue(obj)));
                    } else if (boundSql.hasAdditionalParameter(propertyName)) {
                        Object obj = boundSql.getAdditionalParameter(propertyName);  // 该分支是动态sql
                        sql = sql.replaceFirst("\\?", Matcher.quoteReplacement(getParameterValue(obj)));
                    }else{sql=sql.replaceFirst("\\?","缺失");}//打印出缺失，提醒该参数缺失并防止错位
                }
            }
        }
        return sql;
    }
    @Override
    public Object plugin(Object arg0)
    {
        return Plugin.wrap(arg0, this);
    }

    @Override
    public void setProperties(Properties arg0)
    {
        this.properties = arg0;
    }

    public boolean isWriteInLog() {
        return this.writeInLog;
    }
    public SqlStatementInterceptor setWriteInLog(boolean writeInLog) {
        this.writeInLog = writeInLog;
        return this;
    }

    public long getMaxTime() {
        return this.maxTime;
    }
    public SqlStatementInterceptor setMaxTime(long maxTime) {
        this.maxTime = maxTime;
        return this;
    }

}